TungstenMolybdenumTungsten CompoundsPteridinesCoenzymesMetalloproteinsXanthine DehydrogenasePterinsNitrate ReductasesAldehyde OxidaseNevadaAldehyde OxidoreductasesNitrate ReductaseSulfite OxidaseXanthine OxidaseSulfurtransferasesOxidoreductases Acting on Sulfur Group DonorsFormate DehydrogenasesNitrogenaseElectron Spin Resonance SpectroscopyNitrate Reductase (NADH)MethanobacteriumCobaltSulfurOxidoreductasesIron-Sulfur ProteinsMolybdoferredoxinRhodobacter capsulatusOxidation-ReductionIsotopesAlloysMetal Metabolism, Inborn ErrorsOrganometallic CompoundsBromobenzenesPowders